Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2e44c9334b13f7…

MALICIOUS

PDF

46.6 KB Created: 2020-08-22 04:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03378dd3cba54058b390c83fc3e73c49 SHA-1: 960e52353c2ab7f7001c531214187f59b4421e14 SHA-256: 0f2e44c9334b13f7284925f861045509868bff12511e300fd627ba6a96dc5c02
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links and text that direct users to a suspicious URL, identified as a malicious redirector. The document body, though heavily obfuscated, contains references to 'Nordvpn adblock android' and the malicious URL, suggesting a phishing or scam attempt. The presence of numerous external PDF links also indicates a link farm, likely for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=nordvpn+adblock+android
    • http://files.icemtn.com/uploads/1/3/1/4/131438348/vidamijeminoruge.pdf
    • http://files.addo-pix.com/uploads/1/3/0/7/130775645/volitifodusowe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8530/6782/files/lipewo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6190/3517/files/48527623982.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/baofeng_bf-_888s_frequency_chart.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6203/files/tasaguxeguj.pdf
    • https://cdn.shopify.com/s/files/1/0431/0522/2822/files/nonparametric_statistical_methods.pdf
    • https://cdn.shopify.com/s/files/1/0431/4071/0566/files/16362936004.pdf
    • https://cdn.shopify.com/s/files/1/0432/6916/1110/files/the_psychology_of_esports_a_systematic_literature_review.pdf
    • https://cdn.shopify.com/s/files/1/0432/9229/5332/files/1420189347.pdf
    • https://cdn.shopify.com/s/files/1/0433/7310/1214/files/glutton_berserker_light_novel.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kijajakunij.pdf
    • https://cdn.shopify.com/s/files/1/0430/7596/0985/files/kejamavelixefusata.pdf
    • https://cdn.shopify.com/s/files/1/0433/9495/7470/files/rejogexujusipojawovufidil.pdf
    • https://cdn.shopify.com/s/files/1/0430/5167/9893/files/kosufesugajajilemud.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006798.bin
629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6798 6440 bytes
font_01_sfnt_off0000778c.bin
ca2c8b5e4152379ce12eca547859ad26fdcd86e15ed726e35382d3883e338135		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778C 5120 bytes
font_02_sfnt_off0000890f.bin
1aabb2fd10b74213b6a1eb743505afad54cfb4e00f7315bab65dd17b3164bfa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x890F 10712 bytes

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